Hey guys,

Sprayed the car today and took a scan so I could see exactly what is going on. I am not sure how to post the screen shots at a larger size so I linked to the whole scan too if anyone wants to look at it. The issues that I am having are:

1. When I first floor it to start spraying it seems like it takes a second for the interface to command IAT to the 158* column (even at 100% TPS and within my RPM windows) which leads me to believe that the Microedge is taking a a second to actually start spraying. Is this normal? The beginning of the first scan screenshot shows this perfectly.



2. When I put the clutch in to shift the AF goes crazy rich. This also happens at the end of spraying when the clutch is put in or throttle goes below 100% The first screenshot shows this during shifting and the second screenshot shows this directly after spraying.
Hey guys,

I was just wondering if anyone could take a look at this scan and my tune. I get some REALLY lean spikes on decel sometimes and I just wanted to know if that was kind of normal or if I needed to change something around in my tune?

Here is an example:



I also noticed that my tuner zero'd out the IAT table below 140*. (the -6 above 140* is for my HSW interface to pull timing for nitrous) I was wondering if the IAT retard is something that I should put back in or if it would be OK to leave it out? I am working on my own tune but I was hoping to leave this tune in until mine is done. If it is not safe I will pull it though.

Here is the tune and the full scan (I am spraying at the WOT parts that is why the IAT went to 158*+):
That being said I do LOVE the HSW products and can't wait to throw some more at the car! I just want to make sure the setup is working properly and is safe first!

 

The time lag you are talking about for the timing pull is micro seconds, if any at all, nothing at all to worry about. If it was taking a full second then I would be concerned.

Going rich on decel is normal and many actually get some backfiring at the end of the run. This is mostly due to shutting the throttle closed to quickly, if your not getting back firing out the exhaust on decel don't even worry about it, if you are, just close the throttle slower. On gear change it really doesn't matter, you shift fast enough that you want the a/f ratio staying rich IE: safe. If it was going lean you could have a high rpm lean back fire which often removes the intake manifold, again nothing to worry about.

Lean spikes on decel, well decel is slowing down and fuel should be cut. this is different than a gear change or a quick throttle snap shut at the end of a 1/4 sprayed run.

Having your table zeroed out below 140 degrees is really not an issue. Do you drive aggressively when your motor is cold? No I didn't think so, and that is what stock pull in these tables are for, safety (for dummmies). Remember, you can put different amounts of pull into different columns and change your dip switches to correspond to a different size hit.

I didn't look at your tune but what you posted I don't see anything off hand out of whack, any one else see anything? I believe your just being cautious, and nothing wrong with that, this is how we learn. Knowledge is power.

 

It looks like you may have a 1 second delay in your micro-edge for nitrous activation. Also look into your peddle settings to see if that's why it's not getting right back into it.

The iat table being zero'd out is no big deal, and it's normal to go somewhat lean during decel.

 

Where do you see one second delay? I have timed shifts and for the most part, people make a gear change in less than 1/2 second. If I have time today I will show you guys how to time stuff on your hp tuner logs. what i see above on the advance activation is fine? Am I missing something, lol?
Robert

 

TPS hits 100% at 7320 and IAT doesn't hit 158 until 7330, along with the MAF. That says there's a delay.

All I'm saying is look into the ME settings to make sure nothing has a delay on it.

 

There are no delays set. Robert hit the nail on the head. I'm just trying to be extra cautious. Thanks for the responses guys!

 

I understand this, however, you said one second delay, and that would be a problem. It is pulling timing right away like it should. What we have to remember is timing that is assigned in the n/a tune is based upon a couple factors, RPM, MAF freq and load, so the amount total it shows can vary. have you noticed some spots in your tune may command 35 degrees based upon lower rpm and load, the Interface is still pulling from this base spark, as we can see (look at the second pic and 39 degrees timing). This is why we may want to go back into the tune and command more timing to be pulled down low in the 158 degree column. But my contention is that the Interface is pulling timing as it was commaned and just shows more later in the pull as load goes up and n/a timing is limited to 24/27 degrees or what ever. I can show this in a screen shot if anyone likes. that is why it is important and why i have preached custom timing pull curves. They may be starting the pull a little early in the RPMs? easy enough to fix anyway.

Skull, can we get a screen shot of your IAT table? and also maybe put your indicator line over the activation point on the first pic?
Robert

 

Ill get a screenshot of the IAT table when I get home tonight and a better shot of the scan . The other issue is that the nitrous is supposed to kick in at 3000 rpm and it looks like it is coming in a bit late.

 

So, what is the real time from 7320 to 7330?

 

Robert, here are the screen shots you asked for.

IAT table:



Point where I go to WOT:



Point where Interface kicks in (I guess where spray kicks in too):



Any more help would be great!

 

If you look at the time stamps in the bottom status bar you can see it took 0.547 seconds for the timing pull to "start"

 

Good point. Is this normal or is that too long for this to be happening?

 

is your fuel noid wired independent of the hsw electronics?

i've also had a lean spike or two on decel, but it doesn't always happen and i'm thinking its probably whats left in the line past the noid (after it closes) sort of oozing out after the fuel stops flowing.

 

fuel noid and nitrous noid are both hooked up to the same power and ground from the HSW electronics.

 

Half of a second could simply be an error in refresh rate. SkullV, you have nothing to worry about...enjoy your nitrous.

Nick

 

I thought this could be the case, but it seems like I'm getting a very lean reading for that half second too, so I'm thinking it is actually taking a half second to pull the timing. Maybe I should try a half second leanout delay?

Also, Robert do you have any additional insight from the second set of screen shots I posted?

 

...and the lean spike is less than half of this. There is no problem what so ever. Nothing on safety flag at all, totally normal. If you put your line on the begining of the lean spike and time till it starts correcting you will see it's prob less .200 of a second, a non issue. Like nick siad, refresh rate being unkown will account for some of this time so it's even smaller than the data indicates. Go spray and some fun.

You guys don't need to worry yourselfs about what this or that says on decel, everything is off and that data is useless.
Robert

 

Just thought I would throw this question back up there since it didn't get answered and I am getting ready to put a new kit on the car pretty soon.

 

Anyone?

 

the lag in pulling time will not make it lean, it is lean because it is getting the nitrous before the fuel. differences in pressure( ie 900 comapared to 55). Not much you can do about it, besides purge at the motor before hand or mess with line lengths. A half second of lean out is nothing to worry about at all ecsp since it is prolly less then that depending on the refresh rate of hp tuners.

Not sure If I answered your question. I wouldnt worry about it though at all.